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SN-95 and New Edge Mustangs
New edge front tire width
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<blockquote data-quote="tobynt" data-source="post: 11806269" data-attributes="member: 115996"><p>If you want to match the side profile. You will need to do the math. </p><p></p><p>You may already know this, but for those that stumble across this this. Here is how you break down a tire size and what all of those numbers represent.</p><p></p><p>Tire size and how to read them.</p><p></p><p>285/30/18</p><p></p><p>285 is the width in metric. If you want to convert the metric to inches simply divide 285 by 25.4 (25.4 millimeters equals 1 inch.) 285 millimeters is 11.22 inches. So the tire width is 11.22 inches.</p><p></p><p>30 is the sidewall height of a tire. It represents the percentage of the width. So 30% of 285 millimeters. Simply take 285 and multiply it by 0.3 and that gives you a sidewall height of 85.5 millimeters. take what you learned on converting millimeters to inches and you get 3.366 inches. This number needs to be multiplied by 2 in order to get an overall tire height.</p><p></p><p>18 is the rim diameter in inches.</p><p></p><p>A 285/30/18 is 11.2 inches wide with a sidewall height of 3.36 inches and fits a 18 inch tire. 3.36 multiplied by 2 gives you 6.73 inches plus the 18 inch rim diameter and you have a 24.73 overall diameter tire.</p><p></p><p>Stock on a GT is 245/45/17 which has a 25.68 overall diameter. The first issue I see is that you are 0.95 inches undersized from the original tire size. that is an actual ride height difference of almost an inch. It also shows you why your front tire looks bigger then the back...because it is! Your front tire is almost a half inch taller then the back tire.</p><p></p><p>When you start staggering tires for the front and the back. And, you want the car to have the same "side wall" height. Just need to do the math for each tire. Your back tires have an overall height of 24.73 (when they were new). Now, all you have to do is find a front tire in the width you want that has a side profile that will add up to 24.73 when using an 18" rim.</p><p></p><p>265/45/18 is 27.38" overall</p><p>265/40/18 is 26.34" overall</p><p>265/35/18 is 25.30" overall</p><p>265/30/18 is 24.25" overall</p><p></p><p>Looking at the above, you either have to pick between running a 265 tire in a 30 series (which is about a half inch shorter then the rear) or from a 265 tire in a 35 series (which is a little over a half inch bigger then the rear). I would pick a 265/30/18 that is 24.25" overall for the front if I was going to run a 265 on the front with the tires you currently have on the back. </p><p></p><p>255/45/18 is 27.03" overall</p><p>255/40/18 is 26.03" overall</p><p>255/35/18 is 25.02" overall</p><p>255/30/18 is 24.02" overall</p><p></p><p>Looking at the above, you either have to pick between running a 255 tire in a 30 series (which is about a 3/4" shorter then the rear) or from a 255 tire in a 35 series (which is a little over a 1/4" bigger then the rear). This one would be tough. Its either going to be slightly bigger on the front....or drastically smaller on the front. Depending on how "worn" your rear tires are....the slightly bigger 255/35's may look a lot bigger on the front. But its closer to the over all tire height as the rears (when they were new). A 255 tire on the front would be a toss up and I would probably not look at running a 255 in front with a 285/30/18 in the rear. </p><p></p><p>275/45/18 is 27.74" overall</p><p>285/40/18 is 26.66" overall</p><p>275/35/18 is 25.57" overall</p><p>275/30/18 is 24.49" overall</p><p></p><p>Looking at the above, you would want the 275 tire in a 30 series (which is about a 1/4" shorter then the rear). Again, Depending on how "worn" your rear tires are....the 275/30's may look perfect on the front.</p><p></p><p>Also keep in mind, the difference in the overall tire height from the rear to the front...needs to be divided by 2. So, in appearance....the 275/30/18 will only be 1/8" smaller then the front. (1/8" per side of the tire...)</p><p></p><p>Now, to be honest. The 285/30/18 is not the best tire to run. As you can see from the available tire sizes. None of them match up very well and its over all tire height is about an inch shorter then stock. Unless the car is lowered...your finder to tire gap should be pretty darn big.</p><p></p><p>A better rear tire to run in a 285 width. Would be a 285/35/18 That gets you within 0.174" of the stock design. At an overall tire height of 25.85 v/s stock of 25.68</p><p>This will also open up the door to use a 265 wide tire on the front. But, the 265/35/18 is still about a 1/2" shorter.</p><p></p><p>Lets step back and go even further down on tire width and take a look at the 245 wide tires in an 18" rim size.</p><p></p><p>245/45/18 is 26.68" overall</p><p>245/40/18 is 25.71" overall</p><p>245/35/18 is 24.75" overall</p><p>245/30/18 is 23.78" overall</p><p></p><p>Now, the absolute best tire to run on the front...that will give you a sidewall appearance that matches the rear tire of 285/30/18 is the 245/35/18. This over all tire height is within 0.020 of an inch. A human hair is about 0.005 of an inch. So, the side wall height of the 245/45/18 is within 4 human hairs of being the same size of a 285/30/18...in regards to side wall height.</p><p></p><p>With all of that being said. If you are not running staggered width rims....8" in front and at least a 9" in the rear. Then that set up will bring an all new problem to the table. If your running the same width rim on front and back with that set up. Honestly, its going to look very stupid. The difference in the sidewall bulge will be a lot worse then the difference of a tire looking taller or shorter. A 245" tire looks great on an 8" rim. But it usually makes the sidewalls tapper in too much when running it on a 9" rim.</p><p></p><p>So, what is the width of the front and rear rims you have? Are they the same or different.</p><p></p><p>Also, depending on the manufacturer of the tire depends on how they measure the width of the tire. some measure from the bead width and some measure from the tread width. Depending on sidewall construction depends on how the tire will look on the rim. If its not reinforced it will be relaxed and give a bulging look. If it's reinforced street/open track tire. You will have a nice sharp corner as it comes off the sidewall and goes into the tread.</p><p></p><p>However, for a safety reasons.....I always look at what the tire manufacture says. Because one manufacturer will say his 255 can be ran on an 8 inch rim and another will say it can't. The construction of the tire determines whats safe for the rim width tire fitment not just the mere size of the tire.</p></blockquote><p></p>
[QUOTE="tobynt, post: 11806269, member: 115996"] If you want to match the side profile. You will need to do the math. You may already know this, but for those that stumble across this this. Here is how you break down a tire size and what all of those numbers represent. Tire size and how to read them. 285/30/18 285 is the width in metric. If you want to convert the metric to inches simply divide 285 by 25.4 (25.4 millimeters equals 1 inch.) 285 millimeters is 11.22 inches. So the tire width is 11.22 inches. 30 is the sidewall height of a tire. It represents the percentage of the width. So 30% of 285 millimeters. Simply take 285 and multiply it by 0.3 and that gives you a sidewall height of 85.5 millimeters. take what you learned on converting millimeters to inches and you get 3.366 inches. This number needs to be multiplied by 2 in order to get an overall tire height. 18 is the rim diameter in inches. A 285/30/18 is 11.2 inches wide with a sidewall height of 3.36 inches and fits a 18 inch tire. 3.36 multiplied by 2 gives you 6.73 inches plus the 18 inch rim diameter and you have a 24.73 overall diameter tire. Stock on a GT is 245/45/17 which has a 25.68 overall diameter. The first issue I see is that you are 0.95 inches undersized from the original tire size. that is an actual ride height difference of almost an inch. It also shows you why your front tire looks bigger then the back...because it is! Your front tire is almost a half inch taller then the back tire. When you start staggering tires for the front and the back. And, you want the car to have the same "side wall" height. Just need to do the math for each tire. Your back tires have an overall height of 24.73 (when they were new). Now, all you have to do is find a front tire in the width you want that has a side profile that will add up to 24.73 when using an 18" rim. 265/45/18 is 27.38" overall 265/40/18 is 26.34" overall 265/35/18 is 25.30" overall 265/30/18 is 24.25" overall Looking at the above, you either have to pick between running a 265 tire in a 30 series (which is about a half inch shorter then the rear) or from a 265 tire in a 35 series (which is a little over a half inch bigger then the rear). I would pick a 265/30/18 that is 24.25" overall for the front if I was going to run a 265 on the front with the tires you currently have on the back. 255/45/18 is 27.03" overall 255/40/18 is 26.03" overall 255/35/18 is 25.02" overall 255/30/18 is 24.02" overall Looking at the above, you either have to pick between running a 255 tire in a 30 series (which is about a 3/4" shorter then the rear) or from a 255 tire in a 35 series (which is a little over a 1/4" bigger then the rear). This one would be tough. Its either going to be slightly bigger on the front....or drastically smaller on the front. Depending on how "worn" your rear tires are....the slightly bigger 255/35's may look a lot bigger on the front. But its closer to the over all tire height as the rears (when they were new). A 255 tire on the front would be a toss up and I would probably not look at running a 255 in front with a 285/30/18 in the rear. 275/45/18 is 27.74" overall 285/40/18 is 26.66" overall 275/35/18 is 25.57" overall 275/30/18 is 24.49" overall Looking at the above, you would want the 275 tire in a 30 series (which is about a 1/4" shorter then the rear). Again, Depending on how "worn" your rear tires are....the 275/30's may look perfect on the front. Also keep in mind, the difference in the overall tire height from the rear to the front...needs to be divided by 2. So, in appearance....the 275/30/18 will only be 1/8" smaller then the front. (1/8" per side of the tire...) Now, to be honest. The 285/30/18 is not the best tire to run. As you can see from the available tire sizes. None of them match up very well and its over all tire height is about an inch shorter then stock. Unless the car is lowered...your finder to tire gap should be pretty darn big. A better rear tire to run in a 285 width. Would be a 285/35/18 That gets you within 0.174" of the stock design. At an overall tire height of 25.85 v/s stock of 25.68 This will also open up the door to use a 265 wide tire on the front. But, the 265/35/18 is still about a 1/2" shorter. Lets step back and go even further down on tire width and take a look at the 245 wide tires in an 18" rim size. 245/45/18 is 26.68" overall 245/40/18 is 25.71" overall 245/35/18 is 24.75" overall 245/30/18 is 23.78" overall Now, the absolute best tire to run on the front...that will give you a sidewall appearance that matches the rear tire of 285/30/18 is the 245/35/18. This over all tire height is within 0.020 of an inch. A human hair is about 0.005 of an inch. So, the side wall height of the 245/45/18 is within 4 human hairs of being the same size of a 285/30/18...in regards to side wall height. With all of that being said. If you are not running staggered width rims....8" in front and at least a 9" in the rear. Then that set up will bring an all new problem to the table. If your running the same width rim on front and back with that set up. Honestly, its going to look very stupid. The difference in the sidewall bulge will be a lot worse then the difference of a tire looking taller or shorter. A 245" tire looks great on an 8" rim. But it usually makes the sidewalls tapper in too much when running it on a 9" rim. So, what is the width of the front and rear rims you have? Are they the same or different. Also, depending on the manufacturer of the tire depends on how they measure the width of the tire. some measure from the bead width and some measure from the tread width. Depending on sidewall construction depends on how the tire will look on the rim. If its not reinforced it will be relaxed and give a bulging look. If it's reinforced street/open track tire. You will have a nice sharp corner as it comes off the sidewall and goes into the tread. However, for a safety reasons.....I always look at what the tire manufacture says. Because one manufacturer will say his 255 can be ran on an 8 inch rim and another will say it can't. The construction of the tire determines whats safe for the rim width tire fitment not just the mere size of the tire. [/QUOTE]
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